Contrast-enhanced MRI versus myelography and contrast-enhanced CT in postdiskectomy problems

Area of Science:

• Neurosurgery
• Radiology
• Spinal Imaging

Background:

• Distinguishing epidural scar from recurrent disc herniation post-diskectomy is critical for successful reoperation.
• Epidural scar is vascularized and enhances with contrast, unlike avascular disc material.

Purpose of the Study:

• To evaluate the efficacy of contrast-enhanced MRI in differentiating scar tissue from recurrent disc herniation in patients with persistent lumbar spine symptoms.

Main Methods:

• Ten patients with recurrent symptoms post-lumbar diskectomy underwent myelography, MRI (pre- and post-contrast), and CT (pre- and intra-contrast).
• MRI sequences included T1- and T2-weighted sagittal and axial views.
• Surgical findings were correlated with imaging results.

Main Results:

• Reoperation confirmed scar tissue in 9 out of 10 patients.
• Contrast-enhanced MRI correctly identified scar tissue in 8 cases, showing enhancement absent in disc material.
• MRI diagnosed correctly in 9/10 patients, CT in 3/10, and myelography in none.

Conclusions:

• Contrast-enhanced MRI is superior to non-contrast MRI, CT, and myelography for differentiating epidural scar from recurrent disc herniation.
• Accurate differentiation improves surgical planning and avoids unnecessary reoperations on scar tissue alone.